I'm only guessing! Our grey/green camouflage is also a disruptive pattern, helping to break up or obscure the outline of the object. It shows quite well on the images of the two Victors. The camouflaged one actually appears less distinct, even smaller to my eyes. I would think the assault on the ears of a low flying V-bomber would give it away!
It's a complicated subject. I've got a large book somewhere which describes in detail the different types of camouflage and their uses for everything from ships, aircraft and vehicles to factories and hangars. That typical of RAF aircraft (brown/green or grey/green) falls simultaneously into two main categories, mimicry and disruptive. A lot of work was done on the colours and patterns.The underside colours were generally developed to hide the aircraft against the sky by mimicry alone, colours like Sky, Azure Blue, Mediterranean Blue and later Medium Sea Grey (which was a bit of a compromise). At night of course the aptly named Night did the job.
If you can find an image of a group British soldiers wearing the old DPM in front of a natural background it demonstrates how both elements work together. Not only do the colours merge with the background but it can be difficult to see where one soldier ends and the next begins
Cheers
Steve